When Estimating a Confidence Interval for the Difference Between 2

question 58

Multiple Choice

When estimating a confidence interval for the difference between 2 means using the method where sample variances are pooled, which of the following assumptions is not needed?

• A) The populations are normally distributed.
• B) The populations have equal variances.
• C) The samples are independent.
• D) The sample sizes are equal.

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Definitions:

Secretion

The process by which substances are produced and discharged from cells or glands for a particular function in the organism.

Epithelial

Pertaining to the epithelium, the layer of cells covering internal and external surfaces of the body, including skin, glands, and digestive tract lining.

Electrical Impulses

Signals transmitted by neurons and other cells to communicate information within the body.

Neurons

Electrically excitable cells that process and transmit information through electrical and chemical signals in the nervous system.